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Collection: Controllers & Testing

Testing and monitoring gear for freshwater and reef tanks: reagent kits, digital checkers, meters, probes, and automated controllers. Manual kits confirm a number; controllers watch it around the clock.

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14 of 265 products

API Freshwater Master Test Kit

Test Kit

API Freshwater Master Test Kit

5.0 out of 5 stars, 4 reviews
Regular price $47.15
Sale price $47.15 Regular price
API GH/KH Freshwater Test Kit

Test Kit

API GH/KH Freshwater Test Kit

5.0 out of 5 stars, 2 reviews
Regular price $15.60
Sale price $15.60 Regular price
API Nitrate Test Kit

Test Kit

API Nitrate Test Kit

5.0 out of 5 stars, 1 review
Regular price $18.20
Sale price $18.20 Regular price
API Saltwater Master Test Kit

Test Kit

API Saltwater Master Test Kit

4.0 out of 5 stars, 1 review
Regular price $47.15
Sale price $47.15 Regular price
API Ammonia Test Kit

Test Kit

API Ammonia Test Kit

Regular price $20.80
Sale price $20.80 Regular price
API Alkalinity (KH) Test Kit

Test Kit

API Alkalinity (KH) Test Kit

5.0 out of 5 stars, 1 review
Regular price $10.85
Sale price $10.85 Regular price
API Phosphate Test Kit

Test Kit

API Phosphate Test Kit

5.0 out of 5 stars, 2 reviews
Regular price $19.65
Sale price $19.65 Regular price
API 5-in-1 Test Strips

Test Kit

API 5-in-1 Test Strips

1.0 out of 5 stars, 1 review
Regular price $20.30
Sale price $20.30 Regular price
API Nitrite Test Kit

Test Kit

API Nitrite Test Kit

Regular price $14.75
Sale price $14.75 Regular price
API Reef Master Test Kit

Test Kit

API Reef Master Test Kit

3.0 out of 5 stars, 2 reviews
Regular price $55.40
Sale price $55.40 Regular price
API Calcium Test Kit

Test Kit

API Calcium Test Kit

Regular price $16.75
Sale price $16.75 Regular price
API High Range pH (Marine) Test Kit

Test Kit

API High Range pH (Marine) Test Kit

4.5 out of 5 stars, 2 reviews
Regular price $10.60
Sale price $10.60 Regular price
API Low Range pH (Freshwater) Test Kit

Test Kit

API Low Range pH (Freshwater) Test Kit

Regular price $9.70
Sale price $9.70 Regular price
API Ammonia Test Strips

Test Kit

API Ammonia Test Strips

Regular price $22.45
Sale price $22.45 Regular price

You Can't Correct What You Haven't Measured

Stable water chemistry is the difference between a thriving tank and a stalled one. Testing tells you where you stand; monitors and controllers keep watch when you're not looking.

Levels of Testing and Control

  • Manual test kits — titration-based kits for periodic checks of the core parameters.
  • Digital checkers — handheld colorimeters that remove the guesswork of reading color charts.
  • Continuous monitors — pH, salinity, and temperature meters with calibration solutions.
  • Automation — controllers that log data and switch equipment on set conditions.

A simple community setup needs little more than a master kit. A demanding reef under active dosing earns its keep from digital checkers and a controller that reacts to a failure faster than you can. Choose the level that matches how much risk your livestock represents. Not sure which tier fits your tank? Email info@jlaquatics.com.

J&L Aquatics was formed in December 1997

Our business was started from our love of the aquarium hobby. We at J&L Aquatics felt that the Canadian aquarist should have the option to purchase top quality supplies, equipment and livestock other than the generally over priced local retail stores.